Incoming Mail Server:You can obtain this information from your webmail interface and then going to Settings > Forwarding and POP/IMAP settings. To access your Webmail interface, you can use the URL of the form http://webmail.yourdomainname.com

Username: Enter your full username (same as your email address)

Password: Enter your email password

Click Continue

Enter the following Outgoing Mail Serverinformation:

Outgoing Mail Server:You can obtain this information from your webmail interface at http://webmail.yourdomainname.com and then going to Settings > Forwarding and POP/IMAP settings

Select the box next to Use Authentication

Username: Enter your full username (same as your email address)

Password: Enter your email password

Click Continue

Verify your Account Summary and click Create

IMPORTANT

Usually, the port used for the Outgoing Mail Server/SMTP Service is 25. However, there might be a situation where your ISP might be blocking the use of port 25 for SMTP service. Many ISPs block port 25 in order to minimize the amount of spam sent using their network. If you are facing issues sending mails using the default port 25, you can confirm with your ISP whether port 25 is indeed blocked by them. To circumvent this, you can use an alternate port 587 for sending mails if port 25is blocked. Here's how:

Open the Preferences window and go to Accounts

Select your account from the existing list of accounts and click Server Settings

Under the Server Port field enter the port number as 587

Enter your email address as your username and your password in the respective field and click Ok

Thats it, your account has been setup! You may now send and receive all your emails using Apple Mail 3.0 (Leopard)